Tested with pv $du too.
Even if explicitly set to null pv $du the result is the same.
```
721 xlog("du [$du]\n");
722 $var(var_du) = $du;
723 xlog("var_du [$var(var_du)] len=$(var(var_du){s.len})\n");
724 $du=$null;
725 xlog("du1 [$du]\n");
726 $var(var_du1) = $du;
727 xlog("var_du1 [$var(var_du1)] len=$(var(var_du1){s.len})\n");
```
Log output:
36084 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=721 a=25 n=xlog
36085 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv
[pv_core.c:1427]: pv_get_dsturi(): no destination URI
36086 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>:
**du [<null>]**
36087 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=722 a=63 n=assign
36088 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv
[pv_core.c:1427]: pv_get_dsturi(): no destination URI
36089 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=723 a=25 n=xlog
36090 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>:
**var_du [0] len=1**
36091 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=724 a=63 n=assign
36092 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=725 a=25 n=xlog
36093 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv
[pv_core.c:1427]: pv_get_dsturi(): no destination URI
36094 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>:
**du1 [<null>]**
36095 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=726 a=63 n=assign
36096 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) DEBUG: pv
[pv_core.c:1427]: pv_get_dsturi(): no destination URI
36097 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: ***
cfgtrace:dbg_cfg_trace(): request_route=[REGISTER] c=[/etc/kamailio_scscf/kamailio.cfg]
l=727 a=25 n=xlog
36098 Nov 12 14:14:36 ims_dev-107 kamailio_scscf[10334]: 1(10383) ERROR: <script>:
**var_du1 [0] len=1**
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